Hi,
The flash tool for unlocked Xperia™ devices is called Emma. You don't have to register or login to use the tool, just make sure you have the customization.ini file in the right folder according to step 4 and 5 on the <a href="/services/flash-tool/how-to-download-and-install-the-flash-tool/" title="How to install the flash tool" rel="nofollow">installation page</a>.
Br,
Anna from Developer World
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